I Have A Older Gt Mtb And The Rear Shift/brake Lever Broke. Does Anyone Know If I Can Get The Same One Or Do I Need To Go To An 8 Speed Lever? Will That Work Witha 7 Speed Cassette? It Was An Alivio Shifting A Stx Rear Derailleur But I Can't Seem To Find A 7 Speed Shifter Anywhere On The Net. If I Can Just Replace It With An 8 Speed Lever That Would Be Easy Since They Are Everywhere. Just Looking For Info Before Ordering Something.